Earthquake with magnitude of ML 2.0 on date 21-12-2020 and time 04:33:27 (UTC) in region 3 km NE Scandicci (FI)

A magnitude ML 2.0 earthquake occured in region: 3 km NE Scandicci (FI), on

  • 21-12-2020 04:33:27 (UTC)
  • 21-12-2020 05:33:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.78, 11.19 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Scandicci FI 3 50609 50609
Firenze FI 5 382808 433417
Sesto Fiorentino FI 6 48958 482375
Campi Bisenzio FI 6 46166 528541
Lastra a Signa FI 7 20156 548697
Signa FI 8 19179 567876
Fiesole FI 9 13969 581845
Calenzano FI 10 17489 599334
Bagno a Ripoli FI 11 25611 624945
Impruneta FI 12 14615 639560
Poggio a Caiano PO 12 10007 649567
Prato PO 14 191150 840717
San Casciano in Val di Pesa FI 14 17062 857779
Carmignano PO 15 14450 872229
Montelupo Fiorentino FI 15 14098 886327
Vaglia FI 16 5073 891400
Montespertoli FI 18 13537 904937
Capraia e Limite FI 18 7670 912607
Quarrata PT 19 26190 938797
Pontassieve FI 20 20603 959400

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km NE of Scandicci (50609 inhabitants)
5 Km W of Firenze (382808 inhabitants)
14 Km SE of Prato (191150 inhabitants)
28 Km SE of Pistoia (90315 inhabitants)
53 Km N of Siena (53903 inhabitants)
56 Km E of Lucca (89046 inhabitants)
64 Km E of Pisa (89158 inhabitants)
66 Km NW of Arezzo (99543 inhabitants)
76 Km E of Livorno (159219 inhabitants)
76 Km SW of Imola (69797 inhabitants)
76 Km E of Viareggio (62467 inhabitants)
79 Km SW of Faenza (58541 inhabitants)
80 Km S of Bologna (386663 inhabitants)
84 Km SW of Forlì (117913 inhabitants)
89 Km E of Massa (69479 inhabitants)
93 Km W of Cesena (96758 inhabitants)
94 Km E of Carrara (63133 inhabitants)
99 Km S of Modena (184973 inhabitants)
Recent and historical seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event *

This map reports the earthquake epicenters located in the 72 hours (3 days) preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event *

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located in the 90 days preceding the time of the current earthquake occurrence, using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event *

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019 *

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version https://emidius.mi.ingv.it/CPTI15-DBMI15/) with estimated magnitude ≥ 5.0 since 1000 AD until 2014. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire *

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
ML 2.0 2020-12-21
04:33:27
43.78 11.19 9 2021-02-26
14:56:14
Bollettino Sismico Italiano INGV 86122881
Reviewed
Rev100
ML 2.0 2020-12-21
04:33:27
43.77 11.2 9 2020-12-21
04:41:33
Sala Sismica INGV-Roma 85594101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-21 04:33:27 ± 0.08
Latitude 43.78 ± 0.00
Longitude 11.19 ± 0.01
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86122881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 431
Semi-minor axis of confidence ellipse (meter) 419
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 30
Circular confidence region, given by single value of horizontal uncertainty (meter) 430
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 69
Number of associated phases, regardless of their use for origin computation 47
Number of defining phases 38
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 1.01803
Number of stations at which the event was observed 31
Number of stations from which data was used for origin computation 23
Magnitudes information

ML:2

Field Value
Value 2
Uncertainty 0.4
Num. used stations 46
Type of magnitude ML
Reference to an origin 86122881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-01-27 19:34:05

ML:2

Field Value
Value 2
Uncertainty 0.3
Num. used stations 51
Type of magnitude ML
Reference to an origin 85594101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-21 04:41:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
CR.STON.BHZ. 2020-12-21T04:34:53.62 3.0 undecidable manual Pg 18.129999 0
IV.LAV9.HHZ. 2020-12-21T04:34:33.36 3.0 undecidable manual Sg 6.19 0
IV.MILN.HHZ. 2020-12-21T04:34:32.99 3.0 undecidable manual Sg 8.22 0
IV.RDP.HHZ. 2020-12-21T04:34:27.35 3.0 undecidable manual Sg 1.75 0
IV.QLNO.HHZ. 2020-12-21T04:34:26.21 3.0 undecidable manual Sg 6.53 0
IV.FIAM.HHZ. 2020-12-21T04:34:22.72 3.0 undecidable manual Sg 1.6 0
IV.MNTT.EHZ. 2020-12-21T04:34:22.43 3.0 undecidable manual Sn 3.39 0
IV.CIGN.HHZ. 2020-12-21T04:34:21.65 3.0 undecidable manual Pg 6.28 0
IV.MNTT.EHZ. 2020-12-21T04:33:53.01 3.0 positive manual Pn -1.62 0
IV.CAFI.HHZ. 2020-12-21T04:33:51.24 0.6 undecidable manual S 129 0.7186 50 -0.28 42
IV.CASP.HHZ. 2020-12-21T04:33:47.41 0.1 undecidable manual P 194 1.018 50 1.03 60
IV.FROS.CHZ. 2020-12-21T04:33:46.74 0.3 undecidable manual S 183 0.5711 50 -0.41 63
IV.PII.HHZ. 2020-12-21T04:33:44.18 0.1 undecidable manual S 263 0.4865 50 -0.46 84
IV.SFI.EHZ. 2020-12-21T04:33:44.61 0.6 undecidable manual S 75 0.4865 50 -0.04 46
IV.CPGN.EHZ. 2020-12-21T04:33:43.62 0.3 undecidable manual P 88 0.813 50 0.74 53
IV.BADI.EHZ. 2020-12-21T04:33:43.53 0.3 undecidable manual P 109 0.8067 50 0.76 53
GU.POPM.HHZ. 2020-12-21T04:33:42.09 1.0 undecidable manual S 310 0.411 50 -0.31 22
IV.PARC.HHZ. 2020-12-21T04:33:42.44 0.3 undecidable manual P 100 0.7662 50 0.36 61
IV.FNVD.HHZ. 2020-12-21T04:33:41.75 1.0 undecidable manual S 353 0.3903 50 -0.04 23
IV.CAFI.HHZ. 2020-12-21T04:33:41.65 0.3 undecidable manual P 129 0.7186 50 0.38 61
IV.CSNT.HHZ. 2020-12-21T04:33:39.13 0.6 undecidable manual S 167 0.3148 50 -0.43 44
IV.BRIS.HHZ. 2020-12-21T04:33:39.99 0.6 undecidable manual P 43 0.6052 50 0.66 38
IV.FROS.CHZ. 2020-12-21T04:33:39.05 0.1 undecidable manual P 183 0.5711 50 0.31 86
IV.RINC.HHZ. 2020-12-21T04:33:39.28 0.1 undecidable manual S 70 0.3166 50 -0.31 90
IV.RONT.HHZ. 2020-12-21T04:33:38.53 0.6 undecidable manual S 39 0.2734 106 0.29 46
IV.CRE.HHZ. 2020-12-21T04:33:38.74 0.1 undecidable manual P 106 0.5711 50 0 91
IV.SEI.HHZ. 2020-12-21T04:33:38.86 0.3 undecidable manual S 23 0.2977 50 -0.2 69
IV.PII.HHZ. 2020-12-21T04:33:37.13 0.1 undecidable manual P 263 0.4865 50 -0.16 90
IV.SFI.EHZ. 2020-12-21T04:33:37.33 0.3 undecidable manual P 75 0.4865 50 0.03 69
IV.RUFI.EHE. 2020-12-21T04:33:36.32 0.1 undecidable manual S 76 0.2347 109 -0.49 88
IV.ASQU.HHZ. 2020-12-21T04:33:36.18 0.1 undecidable manual P 88 0.4299 50 -0.15 91
GU.POPM.HHZ. 2020-12-21T04:33:36.33 0.3 undecidable manual P 310 0.411 50 0.33 66
IV.MOCL.EHZ. 2020-12-21T04:33:36.47 0.3 undecidable manual S 358 0.2239 109 0.04 73
IV.FNVD.HHZ. 2020-12-21T04:33:35.77 0.6 undecidable manual P 353 0.3903 50 0.12 46
IV.MPPT.EHZ. 2020-12-21T04:33:35.34 0.3 undecidable manual S 337 0.1916 112 0.08 73
IV.SEI.HHZ. 2020-12-21T04:33:34.01 0.3 undecidable manual P 23 0.2977 50 -0.06 71
IV.RINC.HHZ. 2020-12-21T04:33:34.30 0.1 undecidable manual P 70 0.3166 50 -0.08 95
IV.CSNT.HHZ. 2020-12-21T04:33:33.79 0.3 undecidable manual P 167 0.3148 50 -0.58 63
IV.RONT.HHZ. 2020-12-21T04:33:33.96 0.3 undecidable manual P 39 0.2734 106 0.36 67
IV.MOCL.EHZ. 2020-12-21T04:33:32.32 0.1 undecidable manual P 358 0.2239 109 -0.23 93
IV.RUFI.EHE. 2020-12-21T04:33:32.69 0.1 undecidable manual P 76 0.2347 109 -0.09 96
IV.MPPT.EHZ. 2020-12-21T04:33:31.76 0.1 undecidable manual P 337 0.1916 112 -0.12 96
IV.CRMI.HHZ. 2020-12-21T04:33:31.26 1.0 undecidable manual P 276 0.1556 117 0.12 24
IT.FIE.HGZ. 2020-12-21T04:33:31.39 0.3 undecidable manual S 70 0.0773 136 -0.14 73
IV.FIR.HHZ. 2020-12-21T04:33:30.59 0.3 undecidable manual S 98 0.045 151 -0.18 73
IT.FIE.HGZ. 2020-12-21T04:33:29.81 0.1 undecidable manual P 70 0.0773 136 0.08 99
IV.FIR.HHZ. 2020-12-21T04:33:29.35 0.1 undecidable manual P 98 0.045 151 0.06 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FIR.HNN. ML:2.7 0.0096443595 0.1088 AML other m 2020-12-21T04:33:30.70
IV.FIR.HHN. ML:2.7 0.009842638 0.1024 AML other m 2020-12-21T04:33:30.70
IV.FIR.HNE. ML:2.9 0.015660366 0.1696 AML other m 2020-12-21T04:33:30.67
IV.FIR.HHE. ML:2.9 0.0159246295 0.16 AML other m 2020-12-21T04:33:30.68
IV.CRMI.HHN. ML:1.2 0.00012538605 0.32 AML other m 2020-12-21T04:33:35.35
IV.CRMI.HNN. ML:1.4 0.000248328 0.1984 AML other m 2020-12-21T04:33:35.25
IV.MPPT.EHN. ML:2.1 0.00089787225 0.4 AML other m 2020-12-21T04:33:35.84
IV.MPPT.EHE. ML:2 0.0008340032 0.5184 AML other m 2020-12-21T04:33:35.66
IV.MOCL.EHE. ML:2.2 0.001021947 0.2208 AML other m 2020-12-21T04:33:37.38
IV.MOCL.EHN. ML:2.1 0.0007075866 0.2624 AML other m 2020-12-21T04:33:37.68
IV.CRMI.HNE. ML:1.6 0.00030829695 0.3808 AML other m 2020-12-21T04:33:39.52
IV.CRMI.HHE. ML:1.2 0.00013052245 0.3808 AML other m 2020-12-21T04:33:39.52
IV.RONT.HHN. ML:3.3 0.0092428745 0.1408 AML other m 2020-12-21T04:33:40.20
IV.SEI.HHN. ML:2.8 0.0027431985 0.4 AML other m 2020-12-21T04:33:40.35
IV.RONT.HHE. ML:3.1 0.006617761 0.16 AML other m 2020-12-21T04:33:40.36
IV.CSNT.HHE. ML:2 0.00039255005 0.2816 AML other m 2020-12-21T04:33:40.58
IV.CSNT.HHN. ML:1.9 0.00030753655 0.1792 AML other m 2020-12-21T04:33:40.75
IV.RINC.HHE. ML:2.6 0.0014826545 0.1792 AML other m 2020-12-21T04:33:40.79
IV.FROS.CHN. ML:0 0.0001515 0.5 AML other m 2020-12-21T04:33:48.42
IV.SEI.HHE. ML:2.7 0.0023132815 0.2784 AML other m 2020-12-21T04:33:41.18
IV.RINC.HHN. ML:2.3 0.00075301105 0.4224 AML other m 2020-12-21T04:33:41.62
IV.ASQU.HHE. ML:1.8 0.000186916 0.3008 AML other m 2020-12-21T04:33:43.53
IV.ASQU.HHN. ML:1.8 0.00019729795 1.8208 AML other m 2020-12-21T04:33:43.96
IV.SFI.HNE. ML:1.9 0.00020316675 0.2688 AML other m 2020-12-21T04:33:45.12
IV.SFI.EHE. ML:1.9 0.0001841797 0.2592 AML other m 2020-12-21T04:33:45.13
IV.PII.HHN. ML:2.3 0.000489673 0.2784 AML other m 2020-12-21T04:33:45.84
IV.PII.HHE. ML:2 0.00025678605 0.2592 AML other m 2020-12-21T04:33:45.72
GU.POPM.HHE. ML:1.6 0.0001159148 1.6608 AML other m 2020-12-21T04:33:45.16
IV.SFI.EHN. ML:1.9 0.00016931025 0.24 AML other m 2020-12-21T04:33:46.33
GU.POPM.HHN. ML:1.7 0.00014317825 0.3008 AML other m 2020-12-21T04:33:46.38
IV.FNVD.HHN. ML:2 0.0003495369 0.5792 AML other m 2020-12-21T04:33:46.76
IV.FNVD.HHE. ML:1.8 0.0001930683 0.7968 AML other m 2020-12-21T04:33:46.52
IV.SFI.HNN. ML:2 0.0002426777 0.6304 AML other m 2020-12-21T04:33:47.20
IV.FROS.CHE. ML:0 0.000176801 0.256 AML other m 2020-12-21T04:33:48.08
IV.CRE.HHE. ML:2 0.00019594785 0.4192 AML other m 2020-12-21T04:33:48.12
IV.RIBO.EHE.01 ML:1.6 3.8611235E-5 0.24 AML other m 2020-12-21T04:33:48.74
IV.BRIS.HHE. ML:1.9 0.00015387185 0.32 AML other m 2020-12-21T04:33:52.31
IV.CRE.HHN. ML:2 0.000200502 1.5392 AML other m 2020-12-21T04:33:53.04
GU.CARD.HHN. ML:0 0.000126 0.38 AML other m 2020-12-21T04:33:54.38
GU.CARD.HHE. ML:0 0.0001225 0.48 AML other m 2020-12-21T04:33:54.81
IV.BADI.EHN. ML:1.9 8.8714055E-5 1.76 AML other m 2020-12-21T04:33:57.10
IV.BRIS.HHN. ML:1.9 0.0001508596 0.4992 AML other m 2020-12-21T04:33:57.37
IV.PARC.HHN. ML:2.1 0.0001663005 1.5584 AML other m 2020-12-21T04:33:57.21
IV.PARC.HHE. ML:1.7 7.187026E-5 0.3424 AML other m 2020-12-21T04:33:57.23
IV.BADI.EHE. ML:1.7 5.641668E-5 0.4608 AML other m 2020-12-21T04:34:00.90
IV.CASP.HHN. ML:1.4 1.9000445E-5 0.5408 AML other m 2020-12-21T04:34:03.71
IV.CPGN.EHE. ML:1.8 7.8639415E-5 1.52 AML other m 2020-12-21T04:34:04.08
IV.CASP.HHE. ML:1.4 2.0806745E-5 0.8224 AML other m 2020-12-21T04:34:08.04
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions *

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://terremoti.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in miniseed + resp format Download